I've run turbos for many years, there is an absolute truth to prevent coking in a turbo center section thereby destroying the bearing, one should allow an engine to cool for several min. at idle before shutdown, unless the center section of the turbo is water
cooled, my Duramax powered truck for example. But,
Isn't that the way out boats are operated? You may run one hard, but it's back at idle for a considerable period while docking
anyway, maybe I'm just a wuss, but I don't shutdown until I'm completely tied up or anchor
confirmed well set.
I used to think a pre-luber was the cats meow, I mean everyone knows the majority of engine wear occurs at start-up, right?
Then I drove a Hybrid vehicle for a few years and currently 120,000 miles. Thing is constantly shutting down, and re-starting, by current
thinking, the engine should be worn out in 10,000 miles, but 120,000 miles later, the oil
barely changes color between oil changes, indicating almost zero blowby, so how is that possible?
In short, I think if you keep them serviced, oil, fuel
systems, exhaust elbows regularly replaced, valves properly adjusted and don't ever let water
in the engine, run them correctly, I think a sailboat engine should last essentially forever?
Unless of course you have a motor
vessel with those big white sheet thingies